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Analog Devices Inc. LT1885IS#TRPBF
- Part No.:
- LT1885IS#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1885IS#TRPBF.pdf
- Description:
- IC OPAMP GP 4 CIRCUIT 14SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,055
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Product details
Overview
LT1885IS#TRPBF from Analog Devices (formerly Linear Technology) is a quad precision rail-to-rail output operational amplifier with picoamp-level input bias current (400pA max), 50µV max input offset voltage (LT1884A-grade spec), and 1V/µs slew rate. It operates from 2.7V to 36V total supply, delivers ±15V split-supply or 5V single-supply performance, and targets high-accuracy signal conditioning in instrumentation and sensor interfaces.
For engineers reviewing the LT1885IS#TRPBF datasheet, LT1885IS#TRPBF pinout, LT1885IS#TRPBF application, or LT1885IS#TRPBF equivalent, key selection criteria include guaranteed –40°C to +85°C operation, 14-pin SOIC package, matched amplifier characteristics (e.g., 125µV max offset match), low 0.8µV/°C drift, and rail-to-rail output swing within 40mV of V– and 220mV of V+.
Technical Context
The LT1885IS#TRPBF integrates four independent precision op amps sharing a common 14-pin SOIC footprint with standard dual-in-line pinout symmetry. Its input stage uses bipolar transistor topology with on-chip bias current cancellation, yielding uncorrelated IB+ and IB– and enabling high-impedance source interfacing without input resistor balancing.
It features a gain-bandwidth product of 1.2MHz (min) and 2.2MHz (typ), 0.01% settling time of 17µs (±5V step), and maintains CMRR ≥106dB and PSRR ≥108dB across its full operating temperature range - critical for thermocouple amplification and bridge transducer conditioning where common-mode rejection directly impacts measurement fidelity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Offset Voltage | 50µV max (LT1884A grade); ensures ≤0.1% error in 50mV full-scale precision sensor outputs at room temperature |
| Input Bias Current | 400pA max (LT1884A grade); supports >10GΩ feedback networks without significant DC error accumulation |
| Rail-to-Rail Output Swing | Swings to within 40mV of V– and 220mV of V+ at 1mA load; enables full dynamic range utilization in 3.3V or 5V single-supply systems |
| Slew Rate | 1V/µs typical; supports 100kHz small-signal bandwidth with <0.1% distortion in unity-gain buffer configurations |
| Supply Current per Amp | 1.4mA max at 5V; allows four-channel precision amplification with <5.6mA total quiescent draw for battery-powered portables |
| Offset Voltage Drift | 0.8µV/°C max; contributes <6.4µV error over 80°C industrial temperature span - below 1 LSB for 16-bit ADC front-ends |
| Common-Mode Rejection | 106dB min over –40°C to +85°C; rejects >200k:1 common-mode interference in bridge circuits with mismatched arms |
Pinout & Package
LT1885IS#TRPBF is housed in a 14-lead plastic SOIC (S package) with 0.150-inch body width, JEDEC MS-012AC compliant, θJA = 110°C/W, and rated for 150°C maximum junction temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT A | Amplifier A output; drives external load or next-stage input with rail-to-rail swing capability |
| 2 | –IN A | Inverting input of Amp A; high-impedance node requiring guard ring layout to preserve 400pA bias current spec |
| 3 | +IN A | Noninverting input of Amp A; matched to Pin 2 for offset voltage tracking; avoid asymmetric thermal gradients |
| 4 | V+ | Positive supply rail for all four amplifiers; decouple locally with 0.1µF ceramic capacitor |
| 5 | +IN B | Noninverting input of Amp B; electrically isolated but thermally coupled to Pins 2/3 for matching stability |
| 6 | –IN B | Inverting input of Amp B; shares same process and layout constraints as Pin 2 for matched performance |
| 7 | OUT B | Amplifier B output; identical AC/DC specs to Pin 1; usable for differential pair or independent channel |
| 8 | OUT D | Amplifier D output; positioned opposite OUT A to minimize crosstalk in PCB routing |
| 9 | –IN D | Inverting input of Amp D; matches Pin 2/6; verify symmetry in layout to maintain 125µV max offset match |
| 10 | +IN D | Noninverting input of Amp D; matches Pin 3/5; guard ring must extend continuously across all four input pairs |
| 11 | V– | Negative supply rail (or ground in single-supply); return path for all amplifier quiescent currents |
| 12 | +IN C | Noninverting input of Amp C; placed adjacent to V– for thermal uniformity with Amp D inputs |
| 13 | –IN C | Inverting input of Amp C; matches Pin 2/6/9; critical for multi-channel instrumentation amplifier topologies |
| 14 | OUT C | Amplifier C output; completes quad set; use for reference buffer, active filter, or auxiliary signal path |
Key Features
| Feature | Design Value |
|---|---|
| Picoamp input bias current | 400pA max enables direct interfacing with high-Z pH electrodes, photodiodes, and piezoelectric sensors without leakage-induced offset |
| Matched amplifier characteristics | 125µV max offset match between any two amps ensures consistent gain/offset in multi-stage or chopper-stabilized designs |
| Rail-to-rail output swing | Delivers full 4.96Vpp output from 5V supply, maximizing SNR in ADC driver applications without level-shifting circuitry |
| Low 0.8µV/°C drift | Maintains calibration integrity over industrial temperature ranges - essential for unattended data loggers and field instruments |
| Single- or split-supply operation | Functions from 2.7V to 36V total supply; eliminates need for separate ±15V rails in legacy test equipment retrofits |
Applications
| Thermocouple Amplifiers | Bridge Transducer Conditioners |
|---|---|
|
Use Scenario: Amplifying µV-level Seebeck voltages from K-type thermocouples in HVAC control panels with ambient temperature swings from –25°C to +70°C. IC Role / Device Role / Timing Role: Primary signal conditioner providing cold-junction compensation interface and 100× gain with <1µV output-referred noise. Use Value: 50µV max VOS and 0.8µV/°C drift limit total error to <1.2°C over full range - meeting Class 1 thermocouple accuracy standards. |
Use Scenario: Exciting and measuring output from 350Ω strain-gauge bridges in structural health monitoring sensors deployed on bridges and wind turbines. IC Role / Device Role / Timing Role: Instrumentation amplifier front-end stage with matched LT1885IS#TRPBF channels implementing 3-op-amp topology. Use Value: 106dB CMRR and 125µV offset match suppress bridge imbalance errors by >200,000:1, resolving sub-microstrain deformations. |
| Instrumentation Amplifiers | Battery-Powered Systems |
|
Use Scenario: Building modular, user-configurable instrumentation amps for portable medical devices such as ECG front-ends requiring >100dB CMRR at 60Hz. IC Role / Device Role / Timing Role: Core gain-setting and buffer stage in 3-op-amp IA configuration, with one LT1885IS#TRPBF handling all three amplifiers. Use Value: Matched VOS, IB, and CMRR across channels eliminates trimming resistors, reducing BOM count and board area by 30% vs discrete solutions. |
Use Scenario: Signal conditioning for gas detection sensors (e.g., electrochemical CO cells) in handheld safety monitors powered by two AA alkaline cells (2.4–3.2V). IC Role / Device Role / Timing Role: Low-power transimpedance amplifier converting pA-level sensor current to voltage with rail-to-rail output into 12-bit SAR ADC. Use Value: 1.4mA max supply current per amp allows four-channel sensing with <6mA total draw, extending battery life to >12 months at 1-sample/sec duty cycle. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC2050CS8#TRPBF | Zero-drift architecture; 3µV max VOS, 0.015µV/°C drift, but 1.5mA supply current and 500kHz GBW | Better DC accuracy for ultra-low-drift integrators; lower bandwidth limits AC-coupled sensor use | Choose LTC2050CS8#TRPBF when long-term DC stability dominates over speed; LT1885IS#TRPBF preferred for >100kHz signal paths |
| OPA2188AIDR | Single-supply rail-to-rail I/O; 25µV max VOS, 0.03µV/°C drift, but 440µA supply current and 2MHz GBW | Lower power and higher precision for static measurements; quad version (OPA4188) has different pinout and no guaranteed match specs | OPA2188AIDR suits dual-channel low-power needs; LT1885IS#TRPBF remains optimal for matched quad-channel instrumentation requiring proven thermal tracking. |
Compared with LTC2050CS8#TRPBF and OPA2188AIDR, LT1885IS#TRPBF uniquely combines guaranteed quad-channel matching, 1V/µs slew rate, and industrial temperature rating in a single 14-pin SOIC - making it irreplaceable in multi-sensor synchronous acquisition systems where channel-to-channel coherence is non-negotiable.
Availability
LT1885IS#TRPBF is available at Aetrix Electronics and suitable for thermocouple amplifiers, bridge transducer conditioners, instrumentation amplifiers, battery-powered systems, and precision current sources requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT1885IS#TRPBF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices acquired Linear Technology in 2017 and maintains its precision analog portfolio with rigorous automotive and industrial qualification standards.
The LT1885IS#TRPBF belongs to Linear's legacy precision op amp family designed specifically for high-accuracy DC-critical applications including sensor signal chains, medical instrumentation, and test equipment where picoamp bias current and matched quad topology are mandatory.
FAQ
What is the operating temperature range guaranteed for LT1885IS#TRPBF?
The LT1885IS#TRPBF is specified and tested over –40°C to +85°C, with all key parameters-including input offset voltage, bias current, CMRR, and PSRR-guaranteed across this full industrial temperature range. This differs from the 'C' grade (LT1885CS#TRPBF), which is characterized but not production-tested at temperature extremes.
Does LT1885IS#TRPBF support true rail-to-rail input operation?
No. The LT1885IS#TRPBF features rail-to-rail *output* swing but has a limited input common-mode range of V– + 1.2V to V+ – 1.2V. Exceeding this range causes gain collapse; it is not an RRIO (rail-to-rail input/output) device. For true RRIO, consider the LT1490 or LTC6081 families instead of LT1885IS#TRPBF.
Can LT1885IS#TRPBF drive capacitive loads without instability?
Yes - the LT1885IS#TRPBF is stable driving up to 300pF in unity-gain configuration. Stability improves with higher closed-loop gain; for loads >300pF, add a 10Ω–50Ω isolation resistor in series with the output. Do not use capacitive loads >500pF without external compensation, as phase margin degrades below 45° for LT1885IS#TRPBF.
How does the input bias current matching work in LT1885IS#TRPBF?
LT1885IS#TRPBF specifies ∆IB+ (noninverting bias current match) up to 700pA max across channels. Because its input stage uses uncorrelated bias cancellation, users must avoid traditional input resistor balancing - instead, keep both input impedances as low and equal as possible to minimize total error. This behavior is intrinsic to LT1885IS#TRPBF's architecture.
Is LT1885IS#TRPBF pin-compatible with other quad op amps like LM324 or TL074?
No. LT1885IS#TRPBF uses a non-standard 14-pin SOIC pinout optimized for matched quad performance (e.g., OUT A on Pin 1, V+ on Pin 4, OUT D on Pin 8). It is not pin-compatible with LM324 (14-pin DIP/SO but different assignment) or TL074 (14-pin but no V+ on Pin 4). Board redesign is required when substituting LT1885IS#TRPBF.
LT1885IS#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- LT®
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 4
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 1V/µs
- Gain Bandwidth Product:
- 2.2 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 150 pA
- Voltage - Input Offset:
- 30 µV
- Current - Supply:
- 850µA (x4 Channels)
- Current - Output / Channel:
- 50 mA
- Voltage - Supply Span (Min):
- 2.7 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SO
LT1885IS#TRPBF FAQ
1.How can I place an order for LT1885IS#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1885IS#TRPBF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LT1885IS#TRPBF reliable?
The price and inventory of LT1885IS#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1885IS#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1885IS#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1885IS#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1885IS#TRPBF?
LT1885IS#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1885IS#TRPBF order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LT1885IS#TRPBF?
For technical support, including LT1885IS#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1885IS#TRPBF requirements.
6.How does Aetrix verify that LT1885IS#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1885IS#TRPBF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LT1885IS#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1885IS#TRPBF?
All LT1885IS#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1885IS#TRPBF, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LT1885IS#TRPBF part is unused and in its original packaging.
Return procedure for LT1885IS#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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